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    Date
    SubjectRe: [PATCH v3 2/4] x86/PCI: Add $IRT PIRQ routing table support
    From

    On 3/16/22 21:09, Maciej W. Rozycki wrote:
    > On Tue, 15 Mar 2022, Dmitry Osipenko wrote:
    >
    >>> Handle the $IRT PCI IRQ Routing Table format used by AMI for its BCP
    >>> (BIOS Configuration Program) external tool meant for tweaking BIOS
    >>> structures without the need to rebuild it from sources[1].
    >>>
    >>> The $IRT format has been invented by AMI before Microsoft has come up
    >>> with its $PIR format and a $IRT table is therefore there in some systems
    >>> that lack a $PIR table, such as the DataExpert EXP8449 mainboard based
    >>> on the ALi FinALi 486 chipset (M1489/M1487), which predates DMI 2.0 and
    >>> cannot therefore be easily identified at run time.
    >>>
    >>> Unlike with the $PIR format there is no alignment guarantee as to the
    >>> placement of the $IRT table, so scan the whole BIOS area bytewise.
    > [...]
    >> This patch broke crosvm using recent linux-next. The "ir = (struct
    >> irt_routing_table *)addr;" contains invalid pointer. Any ideas why?
    >
    > This specific pointer refers to the BIOS area being iterated over:
    >
    > for (addr = (u8 *)__va(0xf0000);
    > addr < (u8 *)__va(0x100000);
    > addr++) {
    >
    > and it is conceptually not new code in that a similar piece as below:
    >
    > for (addr = (u8 *)__va(0xf0000);
    > addr < (u8 *)__va(0x100000);
    > addr += 16) {
    >
    > used to be there before my change and even now it is executed earlier on
    > in `pirq_find_routing_table'.
    >
    >> PCI: Probing PCI hardware
    >> BUG: unable to handle page fault for address: ffffed1000020000
    >> #PF: supervisor read access in kernel mode
    >> #PF: error_code(0x0000) - not-present page
    >> PGD 12fff4067 P4D 12fff4067 PUD 12fff3067 PMD 12fff2067 PTE 0
    >> Oops: 0000 [#1] PREEMPT SMP KASAN
    >> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.17.0-rc7-next-20220310+ #226
    >> Hardware name: ChromiumOS crosvm, BIOS 0
    >> RIP: 0010:kasan_check_range+0xe6/0x1a0
    >> Code: 00 74 ee 48 89 c2 b8 01 00 00 00 48 85 d2 75 5d 5b 41 5c 41 5d 5d
    >> c3 48 85 d2 74 63 4c 01 e2 eb 09 48 83 c0 01 48 39 d0 74 55 <80> 38 00
    >> 74 f2 eb d2 41 bd 08 00 00 00 45 29 dd 4b 8d 54 25 00 eb
    >
    > Thank you for your report and apologies for the trouble.
    >
    > I don't know what a "ChromiumOS crosvm" is, but the mention of "Chromium"
    > indicates to me it is something reasonably recent that should be using
    > ACPI rather than legacy PCI IRQ routing, and even then it should be using
    > the standardised $PIR format rather than AMI's proprietary $IRT one. I am
    > more than surprised this code is active for x86-64 even, as this is solely
    > i386 legacy.
    >
    > In any case we need to debug this and possibly work around somehow as
    > this BIOS is likely giving us rubbish information. Unfortunately without
    > access to your Linux build tree along with debug information I can do very
    > little. The faulting piece of code is as follows:
    >
    > 21: 48 83 c0 01 add $0x1,%rax
    > 25: 48 39 d0 cmp %rdx,%rax
    > 28: 74 55 je 7f <foo+0x7f>
    > 2a: 80 38 00 cmpb $0x0,(%rax)
    > 2d: 74 f2 je 21 <foo+0x21>
    >
    > -- with the CMPB at 2a being the offender and further information required
    > as to what RAX holds at the moment.
    >
    > So as the first approximation I would like to see what your BIOS actually
    > tells Linux. Would you therefore please try the following debug patch,
    > boot with the `debug' kernel parameter and send me the resulting bootstrap
    > log?
    >
    > Maciej
    >
    > ---
    > arch/x86/include/asm/pci_x86.h | 2 +-
    > 1 file changed, 1 insertion(+), 1 deletion(-)
    >
    > linux-x86-pci-debug.diff
    > Index: linux-macro/arch/x86/include/asm/pci_x86.h
    > ===================================================================
    > --- linux-macro.orig/arch/x86/include/asm/pci_x86.h
    > +++ linux-macro/arch/x86/include/asm/pci_x86.h
    > @@ -7,7 +7,7 @@
    >
    > #include <linux/ioport.h>
    >
    > -#undef DEBUG
    > +#define DEBUG 1
    >
    > #ifdef DEBUG
    > #define DBG(fmt, ...) printk(fmt, ##__VA_ARGS__)

    Hi Maciej,

    I applied yours patch to today's linux-next and added the `debug` to
    kernel's cmdline, here is the boot log:

    [ 0.000000] Linux version 5.17.0-next-20220321+ (dima@dimapc) (gcc
    (GCC) 11.2.1 20220127 (Red Hat 11.2.1-9), GNU ld version 2.37-10.fc35)
    #242 SMP PREEMPT_DYNAMIC Mon Mar 21 19:27:24 MSK 2022
    [ 0.000000] Command line: panic=-1 acpi=noirq console=ttyS0
    root=/dev/vda rw console=ttyS0 nokaslr rw
    ip=127.0.0.15::127.0.0.2:255.255.255.0 init=/lib/systemd/systemd debug
    [ 0.000000] KERNEL supported cpus:
    [ 0.000000] Intel GenuineIntel
    [ 0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating
    point registers'
    [ 0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
    [ 0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
    [ 0.000000] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256
    [ 0.000000] x86/fpu: Enabled xstate features 0x7, context size is 832
    bytes, using 'standard' format.
    [ 0.000000] signal: max sigframe size: 1776
    [ 0.000000] BIOS-provided physical RAM map:
    [ 0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
    [ 0.000000] BIOS-e820: [mem 0x0000000000200000-0x00000000cfffffff] usable
    [ 0.000000] BIOS-e820: [mem 0x00000000f4000000-0x00000000f7ffffff]
    reserved
    [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000012fffffff] usable
    [ 0.000000] NX (Execute Disable) protection: active
    [ 0.000000] ACPI: MPS support code is not built-in, using acpi=off or
    acpi=noirq or pci=noacpi may have problem
    [ 0.000000] SMBIOS 3.2.0 present.
    [ 0.000000] DMI: ChromiumOS crosvm, BIOS 0
    [ 0.000000] Hypervisor detected: KVM
    [ 0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00
    [ 0.000004] kvm-clock: using sched offset of 184313261 cycles
    [ 0.000016] clocksource: kvm-clock: mask: 0xffffffffffffffff
    max_cycles: 0x1cd42e4dffb, max_idle_ns: 881590591483 ns
    [ 0.000044] tsc: Detected 3403.346 MHz processor
    [ 0.000289] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
    [ 0.000304] e820: remove [mem 0x000a0000-0x000fffff] usable
    [ 0.000315] last_pfn = 0x130000 max_arch_pfn = 0x400000000
    [ 0.000369] x86/PAT: Configuration [0-7]: WB WC UC- UC WB WP UC-
    WT
    [ 0.000396] last_pfn = 0xd0000 max_arch_pfn = 0x400000000
    [ 0.002351] ACPI: Early table checksum verification disabled
    [ 0.002423] ACPI: RSDP 0x00000000000E0000 000024 (v02 CROSVM)
    [ 0.002441] ACPI: XSDT 0x00000000000E0480 00003C (v01 CROSVM CROSVMDT
    00000001 CROS 00000000)
    [ 0.002468] ACPI: FACP 0x00000000000E01C0 000114 (v06 CROSVM CROSVMDT
    00000001 CROS 00000000)
    [ 0.002488] ACPI: DSDT 0x00000000000E0080 00013B (v06 CROSVM CROSVMDT
    00000001 CROS 00000000)
    [ 0.002502] ACPI: FACS 0x00000000000E0040 000040
    [ 0.002514] ACPI: APIC 0x00000000000E0300 000088 (v05 CROSVM CROSVMDT
    00000001 CROS 00000000)
    [ 0.002528] ACPI: MCFG 0x00000000000E03C0 00003C (v01 CROSVM CROSVMDT
    00000001 CROS 00000000)
    [ 0.002539] ACPI: Reserving FACP table memory at [mem 0xe01c0-0xe02d3]
    [ 0.002545] ACPI: Reserving DSDT table memory at [mem 0xe0080-0xe01ba]
    [ 0.002550] ACPI: Reserving FACS table memory at [mem 0xe0040-0xe007f]
    [ 0.002555] ACPI: Reserving APIC table memory at [mem 0xe0300-0xe0387]
    [ 0.002559] ACPI: Reserving MCFG table memory at [mem 0xe03c0-0xe03fb]
    [ 0.002735] Zone ranges:
    [ 0.002742] DMA [mem 0x0000000000001000-0x0000000000ffffff]
    [ 0.002752] DMA32 [mem 0x0000000001000000-0x00000000ffffffff]
    [ 0.002759] Normal [mem 0x0000000100000000-0x000000012fffffff]
    [ 0.002766] Movable zone start for each node
    [ 0.002770] Early memory node ranges
    [ 0.002773] node 0: [mem 0x0000000000001000-0x000000000009efff]
    [ 0.002781] node 0: [mem 0x0000000000200000-0x00000000cfffffff]
    [ 0.002787] node 0: [mem 0x0000000100000000-0x000000012fffffff]
    [ 0.002794] Initmem setup node 0 [mem
    0x0000000000001000-0x000000012fffffff]
    [ 0.002834] On node 0, zone DMA: 1 pages in unavailable ranges
    [ 0.003212] On node 0, zone DMA: 353 pages in unavailable ranges
    [ 0.553684] kasan: KernelAddressSanitizer initialized
    [ 0.555420] TSC deadline timer available
    [ 0.555429] No local APIC present
    [ 0.555433] APIC: disable apic facility
    [ 0.555437] APIC: switched to apic NOOP
    [ 0.555449] smpboot: Allowing 1 CPUs, 0 hotplug CPUs
    [ 0.555668] [mem 0xd0000000-0xf3ffffff] available for PCI devices
    [ 0.555677] Booting paravirtualized kernel on KVM
    [ 0.555700] clocksource: refined-jiffies: mask: 0xffffffff
    max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
    [ 0.555727] setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:1
    nr_node_ids:1
    [ 0.557630] percpu: Embedded 67 pages/cpu s235424 r8192 d30816 u2097152
    [ 0.557651] pcpu-alloc: s235424 r8192 d30816 u2097152 alloc=1*2097152
    [ 0.557662] pcpu-alloc: [0] 0
    [ 0.557721] kvm-guest: PV spinlocks disabled, single CPU
    [ 0.557760] Built 1 zonelists, mobility grouping on. Total pages:
    1031685
    [ 0.557770] Kernel command line: panic=-1 acpi=noirq console=ttyS0
    root=/dev/vda rw console=ttyS0 nokaslr rw
    ip=127.0.0.15::127.0.0.2:255.255.255.0 init=/lib/systemd/systemd debug
    [ 0.561748] Dentry cache hash table entries: 524288 (order: 10,
    4194304 bytes, linear)
    [ 0.563562] Inode-cache hash table entries: 262144 (order: 9, 2097152
    bytes, linear)
    [ 0.563655] mem auto-init: stack:off, heap alloc:off, heap free:off
    [ 0.563683] Stack Depot allocating hash table with memblock_alloc
    [ 0.751869] Memory: 3442904K/4192888K available (28689K kernel code,
    9509K rwdata, 10528K rodata, 1944K init, 12916K bss, 749728K reserved,
    0K cma-reserved)
    [ 0.752348] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
    [ 0.752448] ftrace: allocating 54984 entries in 215 pages
    [ 0.773204] ftrace: allocated 215 pages with 6 groups
    [ 0.773792] Dynamic Preempt: full
    [ 0.774049] Running RCU self tests
    [ 0.774074] rcu: Preemptible hierarchical RCU implementation.
    [ 0.774081] rcu: RCU lockdep checking is enabled.
    [ 0.774087] rcu: RCU restricting CPUs from NR_CPUS=64 to
    nr_cpu_ids=1.
    [ 0.774093] Trampoline variant of Tasks RCU enabled.
    [ 0.774096] Rude variant of Tasks RCU enabled.
    [ 0.774100] Tracing variant of Tasks RCU enabled.
    [ 0.774105] rcu: RCU calculated value of scheduler-enlistment delay
    is 100 jiffies.
    [ 0.774109] rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
    [ 0.791623] NR_IRQS: 4352, nr_irqs: 32, preallocated irqs: 16
    [ 0.792049] rcu: srcu_init: Setting srcu_struct sizes based on
    contention.
    [ 0.793931] Console: colour VGA+ 142x228
    [ 0.914308] printk: console [ttyS0] enabled
    [ 0.915187] Lock dependency validator: Copyright (c) 2006 Red Hat,
    Inc., Ingo Molnar
    [ 0.916771] ... MAX_LOCKDEP_SUBCLASSES: 8
    [ 0.917628] ... MAX_LOCK_DEPTH: 48
    [ 0.918500] ... MAX_LOCKDEP_KEYS: 8192
    [ 0.919407] ... CLASSHASH_SIZE: 4096
    [ 0.920313] ... MAX_LOCKDEP_ENTRIES: 32768
    [ 0.921237] ... MAX_LOCKDEP_CHAINS: 65536
    [ 0.922158] ... CHAINHASH_SIZE: 32768
    [ 0.923134] memory used by lock dependency info: 6365 kB
    [ 0.924311] memory used for stack traces: 4224 kB
    [ 0.925306] per task-struct memory footprint: 1920 bytes
    [ 0.926515] ACPI: Core revision 20211217
    [ 0.927867] ACPI: setting ELCR to 0020 (from 0000)
    [ 0.928977] APIC disabled via kernel command line
    [ 0.930060] APIC: Keep in PIC mode(8259)
    [ 0.930894] clocksource: tsc-early: mask: 0xffffffffffffffff
    max_cycles: 0x310ea79c150, max_idle_ns: 440795317982 ns
    [ 0.933209] Calibrating delay loop (skipped) preset value.. 6806.69
    BogoMIPS (lpj=3403346)
    [ 0.934198] pid_max: default: 32768 minimum: 301
    [ 0.936283] LSM: Security Framework initializing
    [ 0.937299] random: get_random_bytes called from setup_net+0xbc/0x4c0
    with crng_init=0
    [ 0.937546] Mount-cache hash table entries: 8192 (order: 4, 65536
    bytes, linear)
    [ 0.940265] Mountpoint-cache hash table entries: 8192 (order: 4,
    65536 bytes, linear)
    [ 0.946239] x86/cpu: User Mode Instruction Prevention (UMIP) activated
    [ 0.948567] Last level iTLB entries: 4KB 512, 2MB 8, 4MB 8
    [ 0.949194] Last level dTLB entries: 4KB 512, 2MB 32, 4MB 32, 1GB 0
    [ 0.950260] Spectre V1 : Mitigation: usercopy/swapgs barriers and
    __user pointer sanitization
    [ 0.952205] Spectre V2 : Kernel not compiled with retpoline; no
    mitigation available!
    [ 0.952212] Spectre V2 : Vulnerable
    [ 0.955194] Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling
    RSB on context switch
    [ 0.957192] Spectre V2 : Enabling Restricted Speculation for firmware
    calls
    [ 0.958217] Spectre V2 : mitigation: Enabling conditional Indirect
    Branch Prediction Barrier
    [ 0.960193] Spectre V2 : User space: Mitigation: STIBP via prctl
    [ 0.961195] Speculative Store Bypass: Mitigation: Speculative Store
    Bypass disabled via prctl
    [ 0.963216] SRBDS: Unknown: Dependent on hypervisor status
    [ 0.964196] MDS: Mitigation: Clear CPU buffers
    [ 0.988223] Freeing SMP alternatives memory: 48K
    [ 0.990207] smpboot: weird, boot CPU (#0) not listed by the BIOS
    [ 0.991196] smpboot: SMP disabled
    [ 0.993657] cblist_init_generic: Setting adjustable number of
    callback queues.
    [ 0.994194] cblist_init_generic: Setting shift to 0 and lim to 1.
    [ 0.995570] cblist_init_generic: Setting shift to 0 and lim to 1.
    [ 0.997454] cblist_init_generic: Setting shift to 0 and lim to 1.
    [ 0.998355] Running RCU-tasks wait API self tests
    [ 1.002264] Performance Events: IvyBridge events, full-width counters,
    [ 1.002335] no APIC, boot with the "lapic" boot parameter to
    force-enable it.
    [ 1.005195] no hardware sampling interrupt available.
    [ 1.006222] Intel PMU driver.
    [ 1.006891] ... version: 2
    [ 1.007195] ... bit width: 48
    [ 1.008291] Callback from call_rcu_tasks_trace() invoked.
    [ 1.009204] ... generic registers: 8
    [ 1.010195] ... value mask: 0000ffffffffffff
    [ 1.011195] ... max period: 00007fffffffffff
    [ 1.013193] ... fixed-purpose events: 3
    [ 1.014043] ... event mask: 00000007000000ff
    [ 1.015990] rcu: Hierarchical SRCU implementation.
    [ 1.018049] smp: Bringing up secondary CPUs ...
    [ 1.018233] smp: Brought up 1 node, 1 CPU
    [ 1.019203] smpboot: Max logical packages: 1
    [ 1.020220] smpboot: Total of 1 processors activated (6806.69 BogoMIPS)
    [ 1.026922] devtmpfs: initialized
    [ 1.036933] clocksource: jiffies: mask: 0xffffffff max_cycles:
    0xffffffff, max_idle_ns: 1911260446275000 ns
    [ 1.038217] futex hash table entries: 256 (order: 3, 32768 bytes, linear)
    [ 1.041550] PM: RTC time: 16:30:00, date: 2022-03-21
    [ 1.043488] NET: Registered PF_NETLINK/PF_ROUTE protocol family
    [ 1.046179] audit: initializing netlink subsys (disabled)
    [ 1.049355] thermal_sys: Registered thermal governor 'step_wise'
    [ 1.049361] thermal_sys: Registered thermal governor 'user_space'
    [ 1.050344] audit: type=2000 audit(1647880200.313:1):
    state=initialized audit_enabled=0 res=1
    [ 1.053269] cpuidle: using governor ladder
    [ 1.054266] cpuidle: using governor menu
    [ 1.057234] dca service started, version 1.12.1
    [ 1.058389] PCI: Using configuration type 1 for base access
    [ 1.059324] core: PMU erratum BJ122, BV98, HSD29 workaround disabled,
    HT off
    [ 1.107384] Callback from call_rcu_tasks_rude() invoked.
    [ 1.112651] cryptd: max_cpu_qlen set to 1000
    [ 1.120728] ACPI: Added _OSI(Module Device)
    [ 1.121200] ACPI: Added _OSI(Processor Device)
    [ 1.122197] ACPI: Added _OSI(3.0 _SCP Extensions)
    [ 1.123217] ACPI: Added _OSI(Processor Aggregator Device)
    [ 1.124210] ACPI: Added _OSI(Linux-Dell-Video)
    [ 1.125242] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
    [ 1.126203] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
    [ 1.129036] ACPI: 1 ACPI AML tables successfully acquired and loaded
    [ 1.136462] ACPI: Interpreter enabled
    [ 1.137367] ACPI: PM: (supports S0 S1 S5)
    [ 1.138211] ACPI: Using PIC for interrupt routing
    [ 1.139381] PCI: Using host bridge windows from ACPI; if necessary,
    use "pci=nocrs" and report a bug
    [ 1.145033] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-3f])
    [ 1.146228] acpi PNP0A08:00: _OSC: OS supports [ASPM ClockPM Segments
    MSI HPX-Type3]
    [ 1.147216] acpi PNP0A08:00: _OSC: not requesting OS control; OS
    requires [ExtendedConfig ASPM ClockPM MSI]
    [ 1.150992] PCI host bridge to bus 0000:00
    [ 1.151219] pci_bus 0000:00: root bus resource [mem
    0xd0000000-0xf3ffffff window]
    [ 1.153208] pci_bus 0000:00: root bus resource [mem
    0x130000000-0xed0000000 window]
    [ 1.155196] pci_bus 0000:00: root bus resource [bus 00-3f]
    [ 1.156501] pci 0000:00:00.0: [8086:1237] type 00 class 0x060000
    [ 1.159966] pci 0000:00:01.0: [1af4:1052] type 00 class 0x00ff00
    [ 1.161532] pci 0000:00:01.0: reg 0x10: [mem 0xd0000000-0xd0007fff]
    [ 1.166032] pci 0000:00:02.0: [1af4:1052] type 00 class 0x00ff00
    [ 1.167574] pci 0000:00:02.0: reg 0x10: [mem 0xd0008000-0xd000ffff]
    [ 1.172427] pci 0000:00:03.0: [1af4:1050] type 00 class 0x038000
    [ 1.173557] pci 0000:00:03.0: reg 0x10: [mem 0xd0010000-0xd0017fff]
    [ 1.176325] pci 0000:00:03.0: reg 0x20: [mem 0x200000000-0x3ffffffff
    64bit]
    [ 1.180197] pci 0000:00:04.0: [1af4:1042] type 00 class 0x00ff00
    [ 1.181501] pci 0000:00:04.0: reg 0x10: [mem 0xd0018000-0xd001ffff]
    [ 1.186411] pci 0000:00:05.0: [1af4:1044] type 00 class 0x00ff00
    [ 1.187512] pci 0000:00:05.0: reg 0x10: [mem 0xd0020000-0xd0027fff]
    [ 1.189239] random: fast init done
    [ 1.193429] pci 0000:00:06.0: [1af4:1045] type 00 class 0x00ff00
    [ 1.195199] pci 0000:00:06.0: reg 0x10: [mem 0xd0028000-0xd002ffff]
    [ 1.199934] pci 0000:00:07.0: [1af4:1041] type 00 class 0x00ff00
    [ 1.201555] pci 0000:00:07.0: reg 0x10: [mem 0xd0030000-0xd0037fff]
    [ 1.205988] pci 0000:00:08.0: [1b73:1000] type 00 class 0x0c0330
    [ 1.207482] pci 0000:00:08.0: reg 0x10: [mem 0xd0040000-0xd004ffff]
    [ 1.210750] pci 0000:00:09.0: [1b36:0011] type 00 class 0xffff00
    [ 1.211319] Callback from call_rcu_tasks() invoked.
    [ 1.213486] pci 0000:00:09.0: reg 0x10: [mem 0xd0038000-0xd003800f]
    [ 1.216742] pci 0000:00:0a.0: [8086:3420] type 01 class 0x060400
    [ 1.218196] pci 0000:00:0a.0: reg 0x10: [mem 0xd0039000-0xd0039fff]
    [ 1.221324] pci 0000:00:0a.0: PME# supported from D0 D3hot D3cold
    [ 1.225043] pci 0000:00:0a.0: PCI bridge to [bus 01]
    [ 1.226284] pci 0000:00:0a.0: bridge window [mem 0xd0100000-0xd08fffff]
    [ 1.227277] pci 0000:00:0a.0: bridge window [mem
    0x130000000-0x133ffffff 64bit pref]
    [ 1.229335] pci_bus 0000:00: on NUMA node 0
    [ 1.231668] iommu: Default domain type: Translated
    [ 1.232196] iommu: DMA domain TLB invalidation policy: lazy mode
    [ 1.235752] SCSI subsystem initialized
    [ 1.236671] libata version 3.00 loaded.
    [ 1.238530] ACPI: bus type USB registered
    [ 1.239561] usbcore: registered new interface driver usbfs
    [ 1.241289] usbcore: registered new interface driver hub
    [ 1.242299] usbcore: registered new device driver usb
    [ 1.243461] mc: Linux media interface: v0.10
    [ 1.244288] videodev: Linux video capture interface: v2.00
    [ 1.246657] EDAC MC: Ver: 3.0.0
    [ 1.249424] Advanced Linux Sound Architecture Driver Initialized.
    [ 1.253285] NetLabel: Initializing
    [ 1.254056] NetLabel: domain hash size = 128
    [ 1.254196] NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO
    [ 1.256462] NetLabel: unlabeled traffic allowed by default
    [ 1.258491] PCI: Probing PCI hardware
    [ 1.259203] PCI: root bus 00: using default resources
    [ 1.260206] PCI: Probing PCI hardware (bus 00)
    [ 1.261241] PCI: IRQ init
    [ 1.262625] BUG: unable to handle page fault for address:
    ffffed1000020000
    [ 1.263187] #PF: supervisor read access in kernel mode
    [ 1.263187] #PF: error_code(0x0000) - not-present page
    [ 1.263187] PGD 12fff4067 P4D 12fff4067 PUD 12fff3067 PMD 12fff2067 PTE 0
    [ 1.263187] Oops: 0000 [#1] PREEMPT SMP KASAN
    [ 1.263187] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
    5.17.0-next-20220321+ #242
    [ 1.263187] Hardware name: ChromiumOS crosvm, BIOS 0
    [ 1.263187] RIP: 0010:kasan_check_range+0xe6/0x1a0
    [ 1.263187] Code: 00 74 ee 48 89 c2 b8 01 00 00 00 48 85 d2 75 5d 5b
    41 5c 41 5d 5d c3 48 85 d2 74 63 4c 01 e2 eb 09 48 83 c0 01 48 39 d0 74
    55 <80> 38 00 74 f2 eb d2 41 bd 08 00 00 00 45 29 dd 4b 8d 54 25 00 eb
    [ 1.263187] RSP: 0000:ffff8881002c7da0 EFLAGS: 00010297
    [ 1.263187] RAX: ffffed1000020000 RBX: ffffed1000020001 RCX:
    ffffffff8440fd8d
    [ 1.263187] RDX: ffffed1000020001 RSI: 0000000000000004 RDI:
    ffff8880000ffffd
    [ 1.263187] RBP: ffff8881002c7db8 R08: 0000000000000000 R09:
    ffff888000100000
    [ 1.263187] R10: ffffed1000020000 R11: 515249203a494350 R12:
    ffffed100001ffff
    [ 1.263187] R13: 0000000080000000 R14: ffff888000000000 R15:
    ffff8881002c7eb8
    [ 1.263187] FS: 0000000000000000(0000) GS:ffff88810b200000(0000)
    knlGS:0000000000000000
    [ 1.263187] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [ 1.263187] CR2: ffffed1000020000 CR3: 0000000003a29001 CR4:
    0000000000170ef0
    [ 1.263187] Call Trace:
    [ 1.263187] <TASK>
    [ 1.263187] __asan_loadN+0xf/0x20
    [ 1.263187] pcibios_irq_init+0x108/0x54a
    [ 1.263187] ? pci_legacy_init+0x3b/0x3b
    [ 1.263187] pci_subsys_init+0x69/0xa2
    [ 1.263187] do_one_initcall+0xba/0x3e0
    [ 1.263187] ? trace_event_raw_event_initcall_level+0x140/0x140
    [ 1.263187] ? rcu_read_lock_sched_held+0x46/0x80
    [ 1.263187] kernel_init_freeable+0x33c/0x395
    [ 1.263187] ? rest_init+0x280/0x280
    [ 1.263187] kernel_init+0x1e/0x130
    [ 1.263187] ret_from_fork+0x1f/0x30
    [ 1.263187] </TASK>
    [ 1.263187] Modules linked in:
    [ 1.263187] CR2: ffffed1000020000
    [ 1.263187] ---[ end trace 0000000000000000 ]---
    [ 1.263187] RIP: 0010:kasan_check_range+0xe6/0x1a0
    [ 1.263187] Code: 00 74 ee 48 89 c2 b8 01 00 00 00 48 85 d2 75 5d 5b
    41 5c 41 5d 5d c3 48 85 d2 74 63 4c 01 e2 eb 09 48 83 c0 01 48 39 d0 74
    55 <80> 38 00 74 f2 eb d2 41 bd 08 00 00 00 45 29 dd 4b 8d 54 25 00 eb
    [ 1.263187] RSP: 0000:ffff8881002c7da0 EFLAGS: 00010297
    [ 1.263187] RAX: ffffed1000020000 RBX: ffffed1000020001 RCX:
    ffffffff8440fd8d
    [ 1.263187] RDX: ffffed1000020001 RSI: 0000000000000004 RDI:
    ffff8880000ffffd
    [ 1.263187] RBP: ffff8881002c7db8 R08: 0000000000000000 R09:
    ffff888000100000
    [ 1.263187] R10: ffffed1000020000 R11: 515249203a494350 R12:
    ffffed100001ffff
    [ 1.263187] R13: 0000000080000000 R14: ffff888000000000 R15:
    ffff8881002c7eb8
    [ 1.263187] FS: 0000000000000000(0000) GS:ffff88810b200000(0000)
    knlGS:0000000000000000
    [ 1.263187] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [ 1.263187] CR2: ffffed1000020000 CR3: 0000000003a29001 CR4:
    0000000000170ef0
    [ 1.264197] Kernel panic - not syncing: Attempted to kill init!
    exitcode=0x00000009

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